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t in (-oo:+oo)
(5/7)*t-(3/10) = (5/6)*t-(121/70) // - (5/6)*t-(121/70)
(5/7)*t-((5/6)*t)-(3/10)+121/70 = 0
(5/7)*t+(-5/6)*t-3/10+121/70 = 0
10/7-5/42*t = 0 // - 10/7
-5/42*t = -10/7 // : -5/42
t = -10/7/(-5/42)
t = 12
t = 12
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